66 CHAPTER 5
Table 5.5—Test of attrition from the NAADS program and sample selection bias: Second-stage results of the percentage difference in agricultural revenue between matched participants and nonparticipants
Matched sample with attritors
Attritors in matched subsample of nonparticipants
Model specification
Level 1 nearest neighbor NAADSNON-2 I NAADSNON-2 II NAADSNON-3
3 nearest neighbor NAADSNON-2 I
NAADSNON-2 II NAADSNON-3
5 nearest neighbor NAADSNON-2 I
NAADSNON-2 II NAADSNON-3
Levels + squareds 1 nearest neighbor NAADSNON-2 I NAADSNON-2 II NAADSNON-3
Percentage difference
16.37 –3.20 41.06
–7.22
–13.03 –7.20
–1.66
–10.33 –15.88
56.33 84.81* 25.99
Number of non-NAADS participants
60 60 29
148 147 61
202 204 77
59 57
Percentage of matched
non-NAADS participants
13 28 7
21 25 10
23 25 10
20 25
Percentage of total attritorsa
Percentage difference
7
14 6
25 30 19
38 41 26
10 11
–43.62 –17.93 –14.91
–0.41
–12.60 7.08
4.10 –9.74 –13.03 9.76 –21.28 31 13 3 13.40
Matched sample without attritors
Number of non-NAADS participants
59 55 29
141 131 54
193 181 67
55 59 28
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